Question: What is the density of hydrogen peroxide at a temperature of 20.0?
Paraphrase: What is hydrogen peroxide's density at twenty degrees?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q171877 p:P2054 ?s . ?s ps:P2054 ?obj . ?s pq:P2076 ?x filter(contains(?x , '20.0')) }